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Finding the Third Proportional to 128.14 and 197.91

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Solution

The third proportional to 128.14 and 197.91 is: 305.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.14 : 197.91 = 197.91 : x
  2. Step 2: Convert to fraction form
    128.14/197.91 = 197.91/x
  3. Step 3: Cross multiply
    128.14x = 197.91 × 197.91
  4. Step 4: Simplify right side
    128.14x = 39,169.20
  5. Step 5: Solve for x
    x = 39,169.20/128.14
  6. Step 6: Final answer
    x = 305.66

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.